siemens. answers. >> bret: the u.s. wants to beef up its missile defense systems against north korea which recently threatened to launch a nuclear strike. national security correspondent jennifer griffin explains it may come as an expense of an important ally. >> the pentagon announced it was beefing up the missile defense of the united states, adding 14 ground-based interceptors in alaska and california, it also announced it would eliminate phase four of the european missile defense shield, advanced interceptors slated for poland. >> you no longer intend to add aod them to the mix but will continue to have the same number of deployed intercepto interceptors that will provide coverage for all of europe. >> the europeans will see no difference in their ballistic missile defense. >> eliminating the europe missile defense has been a key demand by russia. president obama hinted to then russian president dmitry medvedev about his plans to compromise after the u.s. election. >> after my election i'll have more flexibility. >>